Accurate Cosmology with Near-Infrared Detectors
The Wide Field Infrared Survey Telescope (WFIRST) is an upcoming NASA observatory that will investigate the origins of cosmic acceleration using weak gravitational lensing. WFIRST willperform galaxy shape measurements using Teledyne H4RG-10 infrared devices; thus it is essential to understand inter-pixel non-linear effects like the brighter-fatter effect (BFE) and non-linear inter-pixel capacitance (NL-IPC) that can cause systematic errors in the lensing analysis. The non-destructive readout capability of the H4RG-10 detectors enables correlation measurements on flat field data not only between pixels but also between time frames. I will present recent efforts to characterize prototype WFIRST detectors and discuss the path forward towards controlling measurement systematics and producing exciting and accurate cosmological constraints in the 2020s.